OSD Audio SMP250 User manual

SUBWOOFER
AMPLIFIER
SMP250
OWNERS MANUAL
smp250 amp manual.indd 1 8/1/14 2:41 PM

1. Read these instructions – All the safety and operating instructions should be read before this product is operated.
2. Keep these instructions – The safety and operating instructions should be retained for future reference.
3. Heed all warnings – All warnings on the appliance and in the operating instructions should be adhered to.
4. Follow all instructions – All operating and use instructions should be followed.
5. Do not use this apparatus near water – The appliance should not be used near water or moisture – for example, in a
wet basement or near a swimming pool, and the like.
6. Clean only with a dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manufactures instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including ampliers)
that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding plug. A polarized plug has two blades with one wider
than the other. A grounding plug has two blades and a third grounding prong. The wide blade or the third prong is
provided for your safety. If the provided plug does not t into your outlet, consult an electrician for replacement of the
obsolete outlet.
CAUTION: To reduce the risk of electric shock, do not remove cover or back . No user-serviceable parts inside. Refer
servicing to qualied service personnel.
IMPORTANT SAFETY INSTRUCTIONS
The lightning ash with arrowhead symbol within an equilateral triangle is intended to alert the user to the pres-
ence of un-insulated “dangerous voltage” within the product’s enclosure that may be of sufcient magnitude to
constitute a risk of electric shock.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of important
operating and maintenance (servicing) instructions in the literature accompanying the appliance.
SAFETY
smp250 amp manual.indd 2 8/1/14 2:41 PM

10. Protect the power cord from being walked on or pinched particularly at the plugs, convenience receptacles, and at the
point where they exit from the apparatus.
11. Only use attachments/accessories specied by the manufacturer.
12. Use only with the cart, stand, tripod, bracket, or table specied by the manufacturer, or sold with
the apparatus. When a cart or rack is used, use caution when moving the cart/apparatus
combination to avoid injury from tip-over.
13. Unplug the apparatus during lightning storms or when unused for long periods of time.
14. Refer all servicing to qualied personnel. Servicing is required when the apparatus has been damaged in any way,
such as power supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus has
been exposed to rain or moisture, does not operate normally, or has been dropped.
15. CAUTION: These servicing instructions are for use by qualied service personnel only. To reduce the risk of electric
shock, do not perform any servicing other than that contained in the operating instructions unless you are qualied to
do so.
16. The main plug or appliance coupler is used as the disconnect device, the disconnect device shall remain readily
operable.
17. Do not block any ventilation openings. Leave an open space around the equipment. Never place equipment on a bed,
sofa, rug, or any other similar surface. Do not place equipment close to drapes/curtains/walls or in a bookcase, built-in
cabinet or any other similar place that may cause poor ventilation.
18. Equipment should be connected to the main socket outlet with protective ground connection.
19. The user should not attempt to service the equipment beyond those means described in the operating instructions.
20. Voltage selector: Used to adjust the input rating (120 Vac/60 Hz and 230 Vac/50 Hz), insert the main power plug into
the socket-outlet with voltage within the setting of the selector. The current ratings of the main fuse links are different
for different input rating (see marking for details), and the tted main fuse link is related to the input rating as setting
of the selector during factory assembly line work, please ask a qualied personnel to help you replace the main fuse
link before you adjust the voltage selector. The product can be supplied by two different main voltages
(120 Vac and 230 Vac) that can be selected by adjusting the voltage selector on rear panel. The voltage selector must
be set to match the current main voltage and always checked before inserting the main plug into a socket outlet.
21. WARNING: This class 1 apparatus shall be connected to a main socket outlet with a protective ground connection.
CAUTION: Only make connections when the amplier power is off.
SAFETY
smp250 amp manual.indd 3 8/1/14 2:41 PM

PLACEMENT
INSTALLATION
WARNING: To reduce the risk of re or electric shock, do not expose this amplier to rain or moisture. The amplier shall
not be exposed to dripping or splashing and that objects lled with liquids, such as vases, shall not be placed on or near
the amplier
Congratulations on your purchase of an OSD Audio Amplier. Please take a few moments to read the entire manual and
be sure to retain this document for future reference. Please read and observe all safety instructions.
DO:
• Place the amplier with feet resting rmly on a solid at level surface.
• Place the amplier in a well vented area to provide proper cooling. In areas that lack proper ventilation, such as tight
cabinets or racks, it may be necessary to install an equipment fan to create air ow.
DON’T:
• Do not block ventilation holes on the top or bottom of the amplier. Never place on carpeting or other similar material.
• Do not place amplier in any position other than horizontal with the feet down. Never place on the side or resting on the
back where the terminals are located.
• Do not place the amplier near heat sources or in an area that could be exposed to moisture or excessive humidity.
YOU SHOULD KNOW
• The power supply in this unit may cause a hum that can be heard in other components if they are placed too closely to
the amplier.
Please use Diagram 1. to familiarize yourself the ampliers rear panel.
2014-05-29
以下是 編碼原則
代表公司
MAG0700001
35.00 mm
10 .00 mm
尺寸为35*10m m
代表年
00001代表第1台
00002代表第2台
00003代表第3台
00004代表第4台
以此类推
D代表2003年
E代表2004年
F代表2006年
G代表2007年
以此类推
0 1代表1月份
0 2代表2月份
0 3代表3月份
0 4代表4月份
0 5代表5月份
0 6代表6月份
以此类推
代表月 代表生产序号
35Hz
95Hz 125Hz
180Hz
POWER
POWER
PHASE LOW PASS FILTER VOLUME
SIGNAL
MIN
180°0°
MAX
65Hz 155Hz
L
R
SPEAKER LEVEL IN SPEAKER LEVEL OUT
L
R
IN OUT
LINE
MA
LFE IN LEVEL TRIGGER
ON 12V
MUSIC
OUT
12V TRIGGER
DC 12V 50mA MAX
SUBWOOFER SPEAKER OUTPUT
Rated Input Power: 250W
SERIAL:
iw g
0
230 V
12 V
Fuse: T2AL, 250Vac for 120V~, 60Hz;
Fuse: T1.5AL, 250Vac for 230V~, 50Hz.
SUBWOOFER AMPLIFIER
MODEL NO:SMP250
MADE IN CHINA
i nr
IN
N M X I
SMP
SUBWOOFER
AMPLIFIER
250
SMP
SUBWOOFER
AMPLIFIER
250
Diagram 1
Amplier Rear Panel
Speaker Input
Terminals
Speaker Output
Terminals
Line Input
Line Output
LFE Input
Trigger Switch
Level Control
12V Trigger
Voltage Switch
-
+
IEC Power
Connector
smp250 amp manual.indd 4 8/1/14 2:41 PM

INSTALLATION
1. Connecting the Subwoofer to the Amplier
CAUTION: Only make connections when the amplier power is off.
There are two output terminals on the back of the amplier, one positive and one negative. (Diagram 1). 3 way binding
post output terminals allow for a variety of ways to connect a subwoofer to the amplier, including stripped wire, spade
connectors, etc. Subwoofer must be connected with a minimum of 14-gauge speaker wire. Be sure all connections are
secure.
2. Connecting the Audio Inputs
CAUTION: To avoid possible damage to the Amplier or Subwoofer, only make connections when the amplier is turned
off.
LFE (Low Frequency Effects) Input - If your preamplier or receiver has a Sub output or LFE output you can connect it
to the LFE input. Be aware that using the LFE input bypasses the SMP250’s low frequency (low pass) crossover.
Line Level Inputs (Left & Right) - The line outputs from a preamplier or receiver can be connected to the line level
inputs of the SMP250 amplier with RCA cables. If the line level signal is also required by other equipment, you can
connect the line level outs to another device. (See the Line Level Outputs section below.)
Speaker Level Inputs (Left & Right) - These inputs can be used if your receiver does not have a subwoofer output or a
set of amplier line level output jacks. Be sure to observe proper polarity, connect the left and right pair of main speaker
output wires from your amplier or receiver to the speaker level input terminals of the SMP250 amplier. Then connect a
left and right pair of speaker wires from the SMP250 ampliers speaker level output to your main speaker terminals. (See
Speaker Level Output Section below)
3. Connecting the Audio Outputs (optional)
Line Level Outputs (Left & Right) - Sources connected to the line level inputs can be forwarded to other receivers or
ampliers line level inputs. By doing this you can pass-on the audio signal for use by another component. Connect RCA
cables to the line level output sections of the SMP250 and the line level inputs of a receiver or amplier.
Speaker Level Outputs (Left & Right) - Connect a left and right pair of speaker wires from the SMP250 speaker output
terminals to your main speakers. The main speakers will still be powered by your systems receiver or amplier.
4. Dual Voltage Switch
(See Diagram 2) For use in the U.S., The SMP250 comes preset from the factory at 120V. For use in other countries,
the voltage switch may need to be changed to 230V. (Please note that a plug adapter or alternate power cord may be
required.)
2014-05-29
以下是 編碼原則
代表公司
MAG0700001
35.00 mm
10.00 mm
尺寸为35*10m m
代表年
00001代表第1台
00002代表第2台
00003代表第3台
00004代表第4台
以此类推
D代表2003年
E代表2004年
F代表2006年
G代表2007年
以此类推
0 1代表1月 份
0 2代表2月 份
0 3代表3月 份
0 4代表4月 份
0 5代表5月 份
0 6代表6月 份
以此类推
代表月 代表生产序号
35Hz
95Hz 125Hz
180Hz
POWER
POWER
PHASE LOW PASS FILTER VOLUME
SIGNAL
MIN
180°0°
MAX
65Hz 155Hz
L
R
SPEAKER LEVEL IN SPEAKER LEVEL OUT
L
R
IN OUT
LINE
MA
LFE IN LEVEL TRIGGER
ON 12V
MUSIC
OUT
12V TRIGGER
DC 12V 50mA MAX
SUBWOOFER SPEAKER OUTPUT
Rated Input Power: 250W
SERIAL:
iw g
0
230V
12 V
Fuse: T2AL, 250Vac for 120V~, 60Hz;
Fuse: T1.5AL, 250Vac for 230V~, 50Hz.
SUBWOOFER AMPLIFIER
MODEL NO:SMP250
MADE IN CHINA
i nr
IN
N M X I
SMP
SUBWOOFER
AMPLIFIER
250
SMP
SUBWOOFER
AMPLIFIER
250
Diagram 2
Voltage Switch
smp250 amp manual.indd 5 8/1/14 2:41 PM

OPERATION
Please use diagrams 1&3 to familiarize yourself with the front and rear panels of the SMP250.
CAUTION: Please read all of the following instructions to prevent causing damage to your system.
FRONT PANEL CONTROLS
• Power Switch
The switch marker “power” on the front panel of the amplier will turn off all amplier circuitry including Auto Sense
circuitry.
• Volume Controls
Use this to match the output level of the subwoofer to that of the main speakers in the system. We recommend that you
play a variety of material before selecting a setting. Start with the control turned completely counterclockwise (off) and
slowly turn it up. NOTE: Turning the volume up slowly will prevent possible damage to the woofer from the system being
run too “hot”. Very little movement of the knob is needed.
CAUTION: If a popping sound (clipping) is audible through the subwoofer, it is being overdriven, reduce the volume on
the SMP250, or speaker damage may occur! (See Volume Limit Control for proper adjustment of volume settings to avoid
distortion damage.)
• Low Pass Filter
Use this control to adjust the upper frequency limit of the subwoofer. The purpose is to control the overlap of the
subwoofers upper frequencies and the main speakers lower frequencies. If adjusted properly this will provide seamless
blending of the subwoofer and the main speakers.
• Phase Control
This control allows you to match the arrival times of the sound waves from the subwoofer and the main speakers to your
listening area. While the system is playing ip the switch to the 180˚ setting and back to 0˚ until the bass sounds louder or
less boomy. Depending on the subwoofers placement and room acoustics, this control may have little or no effect.
2014-05-29
以下是 編碼原則
代表公司
MAG0700001
35.00 mm
10 .00 mm
尺寸为35*10m m
代表年
00001代表第1台
00002代表第2台
00003代表第3台
00004代表第4台
以此类推
D代表2003年
E代表2004年
F代表2006年
G代表2007年
以此类推
0 1代表1月份
0 2代表2月份
0 3代表3月份
0 4代表4月份
0 5代表5月份
0 6代表6月份
以此类推
代表月 代表生产序号
35Hz
95Hz 125Hz
180Hz
POWER
POWER
PHASE LOW PASS FILTER VOLUME
SIGNAL
MIN
180°0°
MAX
65Hz 155Hz
L
R
SPEAKER LEVEL IN SPEAKER LEVEL OUT
L
R
IN OUT
LINE
MA
LFE IN LEVEL TRIGGER
ON 12V
MUSIC
OUT
12V TRIGGER
DC 12V 50mA MAX
SUBWOOFER SPEAKER OUTPUT
Rated Input Power: 250W
SERIAL:
iw g
0
230 V
12 V
Fuse: T2AL, 250Vac for 120V~, 60Hz;
Fuse: T1.5AL, 250Vac for 230V~, 50Hz.
SUBWOOFER AMPLIFIER
MODEL NO:SMP250
MADE IN CHINA
i nr
IN
N M X I
SMP
SUBWOOFER
AMPLIFIER
250
SMP
SUBWOOFER
AMPLIFIER
250
REAR PANEL CONTROL
• Volume Limit Control
(See diagram 1) Use this control to adjust the maximum volume setting for your subwoofer system. With the level control
and the front panel volume turned all the way down (counterclockwise), turn the subwoofer on and with audio playing
through the system adjust the maximum volume level desired. Setting a max volume level will ensure that no clipping or
damage will occur even when the front panel volume control is turned all the way up.
Diagram 3
Amplier Front Panel
smp250 amp manual.indd 6 8/1/14 2:42 PM

TROUBLESHOOTING
WARRANTY & REPAIR
All OSD AUDIO electronics have (2) year Limited Warranty against defects in materials and workmanship. Proof of purchase must accompany all claims. During
the warranty period OSD AUDIO will replace any defective part and correct any defect in workmanship without charge for either parts or labor
OSD AUDIO may replace returned electronics with a product of equal value and performance. In such cases, some modications to the mounting may be
necessary and are not OSD AUDIO’s responsibility.
For this warranty to apply, the unit must be installed and used according to its written instructions. If necessary, repairs must be performed by OSD AUDIO. The
unit must be returned to OSD AUDIO at the owner’s expense and with prior written permission. Accidental damage and shipping damage are not considered
defects, nor is damaged resulting from abuse or from servicing performed by an agency or person not specically authorized in writing by OSD Audio
OSD AUDIO sells products only through authorized dealers and distributors to ensure that customers obtain proper support and service. Any OSD AUDIO
product purchased from an unauthorized dealer or other source, including retailers, mail order dealers and online sellers will not be honored or serviced under
existing OSD AUDIO warranty policy. Any sale of product by an unauthorized source or other manner not authorized by OSD AUDIO shall void the warranty on
the applicable product.
Damage to or destruction of components due to application of excessive power voids the warranty on those parts. In these cases, repairs will be made on the
basis of the retail value of the parts and labor. To return for repairs, you must email customer service at [email protected] for a Returned Merchandise
Authorization (RMA) number then the unit must be shipped to OSD AUDIO at the owner’s expense, along with a note explaining the nature of service required.
Be sure to pack the product(s) in a corrugated container with at least 3 inches of resilient material to protect the unit from damage in transit.
This Warranty Does Not Cover: Damage caused by abuse, accident, misuse, negligence, or improper operation (installation) • Any products that have been
altered or modied • Any product whose identifying number of decal, serial #, etc. has been altered, defaced or removed • Normal wear and maintenance.
The SMP250 Subwoofer Amplier is designed to function trouble free. Most problems occur because pf operating errors.
If you have a problem, please check the troubleshooting list rst. If the problem persists, contact tech support at
1-562-697-2600 or e-mail us at [email protected].
Problem Possible Causes and Solutions
No sound is heard
a. Audio to the amplier is not connected properly. Check this and other system component manuals to ensure
proper connection.
b. The cable is bad. Use another cable that you know is good.
c. Loose or frayed wires. Check for secure clean connections on all speaker wire terminals.
d. Volume Limit Control is set too low. See Volume Limit Control for adjustment procedure.
A hum or buzzing sound is heard
a. The sound may be caused by a ground loop in the system. Try to eliminate this by reversing the AC plugs of
other components in the system.
b. Try plugging the SMP250 into another outlet.
c. Other causes may include faulty cables.
The Amplier will not turn on
a. There may be AC power problems. Check the AC circuit and plugs. Make sure power switch is turned on.
b. Audio cable to the amplier is not connected properly. Check this and other system component manuals to
ensure proper connection.
c. The cable is bad. Use another cable that you know is good.
d. Loose or frayed wires. Check for secure clean connections on all speaker wire terminals.
The Protection Circuit cuts in
momentarily and then returns to
normal
The circuitry in the amplier has detected that the amplier is in danger of overheating. Normally, this would
happen infrequently and momentarily. If this persists, the amplier may need more adequate ventilation.
Protection Circuit cuts in and
does not return to normal
There may be a fault in the wiring with the speaker or the amplier. Turn the power switch off then on again. If the
amplier immediately returns to protection mode, turn it off and check all of the wiring including connections at the
amplier, subwoofer and any connections made to the terminals on a wall plate.
smp250 amp manual.indd 7 8/1/14 2:42 PM

SPECIFICATIONS
Type: Mono Subwoofer Amplier
Power Output: 150W RMS @ 8 Ohm
200W Peak @ 8 Ohm
Crossover: Variable Low Pass Crossover 35Hz - 180Hz
Auto Off Time: 5 sec.
Auto On Sensitivity: 5mV
Dual Voltage 120V - 230V
Dimensions (DxWxH) 9¼" x 16¼" x 3" (235mm x 413mm x 76mm)
Warranty: Limited 2 Year
OSD Audio | 775 Columbia Street Brea, CA. 92821 |osdaudio.com
smp250 amp manual.indd 8 8/1/14 2:42 PM